Ductile filament.



high sinterinfi UNITED- STATES PATENT OFFICE.

' OW I. THOWLESS, OI NEWARK, :mw J'EIIEY. AISIGN'OB OF ONE-HALF TO ARTHUR I. THOWLESS, 0F NEWARK, NEW JERSEY.

80 Drawing.

and State of New Jersey, have invented new and useful Improvements in Ductile Filaments, of which the following is a specification.

The object of my invention is toproduoe' ductile filaments to be used in electrical incandescent lamps which shall be free from all undesirable and deleterious substances and which shall not darken the eontainin bulbs while lighted, although wire,rods an filaments for other purposes may be pro-' du'ced by my method.

To attain this object, I press powdered tungsten into a mold by means of a hydraulic press and form sticks or rods, which may be a quarter of an inch in diameter and about six inches long. A stick, so pressed,

is heated in an atmosphere of hydrogen until it becomes strong enough to be easily handled. It is thenplaced m a flashing-jar or other suitable vessel, and heated to a temperature in' the presence of an atmos ere composed of the vapor of a halo n sa t of tun sten, such as the hexachlori and dry hydrogen. This causes a deposit of tungsten to orm in and to perwhile it a structurally solid billet or slug of metal.

' as the spaces between the particles of the powdered tungsten 'will become filled with the flashed metal and united closely therewith. Some part of the flashed metal will be deposited on the surface of the sl after the spaces are filled up, but this improve the slug and tend to make it more uniform. After the slug is thoroughly sintered. and. treated with the tungsten flashing', the flashing-jar may be exhausted and the treated slug be heated and submitted to the action of exhaust pumps to remove any occluded gases therefrom. The s1 1s slowl cooled and submitted to hot-wor and into filamentary diameter.

Other metals than timgsten may be llS0d" for the p powder and also for the flashing as,for instance, a flashing of tho rium may be given to a mass of tungsten, or a of two or more metals maybe app i to ne or more metal'powdgm Il 3 specification of Letters Patent.

, and

Patented May 22,, 1917.

, Application fled August 9, 1815. Serial No. 44,512.

pressed powders during the sintering' of the latter, the flashing does not merely 10in the outer particles of the powder together, but appears to permeate the entire mass and tends to solidify it; therefore thorium may be used with advantage as a permeating material with the powdered slug.

What I claim is:

1. In the method makingductile wire the step which consists in sintering a mass of compressed refractory metal powder in the presence of a mixture of dry hydrogen .and the vapor of a halogen salt of a refractory metal. 2. In'the method of making ductile wire the steps, which consist in heatin a mass of V refractorymetal powder to a hig tem ra-. ture, bringing into contact with it, while in such heated condition, a mixture of dry hydrogen and the vapor of a salt of tungsten, causing flashed tun ten to unite with the powdered metal, an maintaining such heat until the united materials are consolidated into a structurally solid body.

' 3. In the method of making ductile filaments, the steps, which consist in uniting flashed refractory metal with powdered refractory metal in a manner to form a mixture of the two and at the same time consolidatin the entire mass into a structurally solid b y.

4. The method'bf making ductile filaments, which consists in uniting flashed refractory material with powdered refractory material in a manner to form a mixture of the two, at the same time consolidatin the entire mass into a structurally solid ody, workin this body into a fibrous structure ucing it to a filamentary diameter.

5. In the method of making ductilqfilaments the step which consists in sinterlng a body of refractory metal powder, m an atmosphere of reducing s and the vapor of a halogen salt of a re ractory metal to the extent of causing the metal contamed 1n the halogen vapor to permeate and fill up the spaces existing between the articles of meta powder composing the y, thereby owdered rea. 'ng of re ween and unite i it 7. In the method of making lluctile filaments the steps which consist in permeating powdered refractory metal bodies, during the operation of sintering, with deposited metal and forming them into solid homogeneous bodies.

8. A filament composed of refractory metal having permeated through its pores a different refractory metal.

9. A filament composed of tungsten haviu g permeated through its pores a deposit of tungsten.

10. A body of refractory metal-composed of partly sintered and partly deposited metal, the deposited metal permeating the said body throughout its entire structure.

11. A body of refractory metal having united within itself and forming a coherent part therewith a deposit of refractory substance permeating the said body. I

ORLANDO M. THOWLESS. Witnesses:

Jo! lN GLENN BLUmmoN,

HERBERT L. THOWLESS. 

